/**
 * @license
 * Copyright 2025 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
export interface ColorObject {
    readonly r: number;
    readonly g: number;
    readonly b: number;
    readonly a: number;
}
/**
 * Parse a `#RGB` / `#RGBA` / `#RRGGBB` / `#RRGGBBAA` hex color into a {@link ColorObject}.
 * Case-insensitive on input. No whitespace tolerance. Shorthand nibbles are doubled.
 * Throws on any malformed input.
 */
export declare function parseHexColor(hex: string): ColorObject;
/**
 * Emit a {@link ColorObject} as `#RRGGBB` when `a === 255`, otherwise `#RRGGBBAA`.
 * Always lowercase, never shorthand. Throws on non-integer or out-of-range channels.
 */
export declare function toHexColor(c: ColorObject): string;
/**
 * Type guard for a {@link ColorObject}-shaped value (alpha optional).
 * Does not reject extra properties — JSON Schema validation handles that separately.
 */
export declare function isColorObject(value: unknown): value is ColorObject;
/** Type guard for a hex color string (same regex as `parseHexColor`). */
export declare function isHexColor(value: unknown): value is string;
/**
 * Normalize any accepted wire form to a full {@link ColorObject}. Object inputs
 * default `a` to 255; CSS `rgb(...)` / `rgba(...)` strings use 0-1 alpha.
 * Throws on anything that's not an accepted color value.
 */
export declare function resolveColor(value: string | {
    r: number;
    g: number;
    b: number;
    a?: number;
}): ColorObject;
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